import type { ABTaskScore, SignificanceResult } from './types.ts';
export declare function mean(values: number[]): number;
export declare function sampleStdDev(values: number[]): number;
export declare function pairedTTest(differences: number[]): {
    tStatistic: number;
    pValue: number;
    df: number;
};
export declare function cohensD(differences: number[]): number;
export declare function effectLabel(d: number): 'negligible' | 'small' | 'medium' | 'large';
export declare function aggregateABScores(taskScores: ABTaskScore[], metrics: string[]): {
    aggregateA: Record<string, number>;
    aggregateB: Record<string, number>;
};
export declare function determineWinner(aggregateA: Record<string, number>, aggregateB: Record<string, number>, metrics: string[]): 'A' | 'B' | 'tie';
export declare function computeSignificance(differences: number[]): SignificanceResult;
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